Filetrek is another web cloud file sharing service that lets users store, backup and share files easily. It uses a small client, backup your files to web cloud space in real time. If you don't like to install anything in your computer, just use web page to upload files. It also allows your friend share file, like view, download. It's a commercial service, but also offers free version accounts that have 5GB space. If you needed more space or more functions, you should to buy.